sholes: allow setting of default colorformat to yuv422i

the sholes libcamera does not properly report that it requires the use
of YUV422InterlacedYUYV color format in order to function.  as
stagefright defaults to YUV420SemiPlanar, this causes issues.  this
patch introduces and #ifdef that allows sholes (and anyone else who may
need it) to change the default color format

Change-Id: Ieec607dc62820e47a0e239d05356a0bfdf0ceed6